Hiietam, Katrin. 2005. Case marking in Estonian grammatical relations. Leeds Working Papers in Linguistics and Phonetics 10.
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.8240
@article{sinnemakizeromarking-Hiietam2005,
author = {Hiietam, Katrin},
journal = {Leeds Working Papers in Linguistics and Phonetics},
title = {Case marking in Estonian grammatical relations},
url = {http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.8240},
volume = {10},
year = {2005}
}